During relay pumping, hose should be pumped at pressures that do not exceed _____ percent of the annual service test pressure

In normal individuals, approximately what fraction of the VT is wasted ventilation (does not par-ticipate in gas exchange)?

a. One-third of the tidal volume b. Two-thirds of the tidal volume c. One-half the of tidal volume d. One-quarter of the tidal volume

The chief source of error in kidney evaluation using the excretion rate of substance is:

A. The chemical method of analysis. B. The timing and completeness of collection. C. The test chosen for the evaluation. D. The day-to-day variation of renal function.